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Table 1 Summary of test results.

From: Axial–Flexural Interaction in FRP-Wrapped RC Columns

Specimen designationa Loading eccentricity (mm) Pu (kN) Ki (kN/mm) Δu (mm) Δmax (mm) Δl (mm) μ Toughness (kN mm) Moment (kN m)
G0-U-A 0 1529 2896 0.76 0.95 2.00 715 0
G0-U-B 1573 3692 0.62 0.75 1.82 618
G0-C-A 0 1930 1986 4.56 4.57 5.60 7356 0
G0-C-B 1872 (123)b 2027 (61) 2.70 (526) 2.75 (431) 3.67 (243) 3853 (841)
G0-LC-A 0 1987 2079 4.93 5.36 5.91 8335 0
G0-LC-B 2041 2299 3.22 3.93 4.68 5300
G0-LC-C 2021 (130)b 2114 (66) 3.72 (573) 4.07 (524) 3.77 (251) 5517 (957)
G25-U-A 25 1351 2213 0.82 0.94 2.30 1.80 680 36.9
G25-U-B 1154 2385 0.71 0.76 0.64 1.88 497 29.6
G25-C-A 25 1545 2724 1.27 1.80 7.34 3.50 1397 50.0
G25-C-B 1580 (125)b 1912 (101) 1.68 (192) 3.23 (296) 7.32 (499) 3.70 (196) 1862 (277) 51.1 (152)
G25-LC 25 1682 (134)b 2070 (90) 1.37 (178) 1.65 (194) 1.89 (129) 2.97 (161) 1542 (262) 45.2 (136)
G50-U-A 50 900 NA NA NA 3.34 NA NA 48.0
G50-U-B 894 1501 0.62 0.65 2.43 1.16 280 46.7
G50-C 50 1210 (135)b 2216 (148) 0.83 (134) 1.05 (162) 5.50 (191) 1.94 (167) 639 (228) 67.2 (142)
G50-LC-A 50 1341 1633 1.58 1.61 1.81 1.92 1527 69.5
G50-LC-B 1303 (147)b 1603 (108) 1.12 (218) 1.18 (215) 3.80 (97) 1.66 (154) 905 (434) 70.1 (147)
G65-U 65 789 1803 0.63 0.80 3.20 1.92 318 53.8
G65-C 65 1048 (133)b 1693 (94) 1.41 (224) 1.59 (199) 8.60 (269) 2.60 (135) 1123 (353) 77.1 (143)
G65-LC 65 1122 (142)b 2032 (113) 0.97 (154) 1.20 (150) 7.90 (247) 2.57 (134) 747 (235) 81.8 (152)
GINF-U-A Infinite 117 20.6 20.47 25.76 3.98 2425 22.4
GINF-U-B 125 19.2 17.09 17.82 4.12 1625 24.0
GINF-C-A Infinite 127 24.4 24.62 24.62 6.84 2505 24.4
GINF-C-B 134 (108)b 22.4 (118) 28.24 (141) 28.24 (243) 5.98 (158) 3158 (140) 25.7 (108)
GINF-LC Infinite 260 (215)b 24 (121) 16.14 (86) 16.14 (74) 2.17 (54) 2492 (123) 49.9 (215)
  1. NA: Axial displacement measurements were dismissed for this specimen.
  2. aG0, G25, G50 and G65 is the group designation indicating the loading eccentricity in mm; GINF is the group designation indicating column tested in pure bending; U: Unwrapped specimen; C: Column wrapped with a circumferential CFRP ply; LC: Column wrapped with two CFRP plies: one longitudinal and another circumferential.
  3. bNumbers between brackets in this row are computed as the ratio of the response parameter (average value in case of specimen duplicates) to that of the control unwrapped companion specimen (average value in case of specimen duplicates) tested under the same load eccentricity, expressed as a percent.